Full-page zoom won already. Browsers all make it very difficult to even scale the font size without zooming the page (Firefox is the easiest, with the setting buried in a submenu as a toggle). And frankly, scaling just the fonts but leaving the rest of the layout is a bad experience: scaling just the font size often breaks the layout, particularly around interactive controls like buttons and tabs. There are two good paths to accessibility here: full-page zoom, and reader mode.